While Traveling the Galaxy in a Spacecraft,you and a Colleague

question 86

Multiple Choice

While traveling the galaxy in a spacecraft,you and a colleague set out to investigate the 10⁶M_⨀ black hole at the center of our galaxy.She hops aboard an escape pod and drops into a circular orbit around the black hole,maintaining a distance of 1 AU,while you remain much farther away in the spacecraft.After doing some experiments to measure the strength of gravity,your colleague signals her results back to you using a green laser.What would you see? Hint: you will need to calculate the location of the event horizon.

• A)Her signals are shifted only slightly toward the red because she is orbiting well outside the event horizon of the black hole.
• B)You would see her signals shifted to a much redder wavelength because she is close to the event horizon.
• C)You would see nothing,because your colleague has crossed the event horizon around the black hole.
• D)You would see nothing,because no light can escape the gravitational pull of a black hole no matter how far she is from it.
• E)You would see her signals shifted to a much bluer wavelength because black holes can make highly energetic light.

---

Definitions:

Economy

An area or system in which goods and services are produced, distributed, and consumed by various agents, encompassing local to global scales.

Recession

A significant decline in economic activity spread across the economy, lasting more than a few months, typically visible in real GDP, real income, employment, industrial production, and wholesale-retail sales.

Unemployment Compensation Benefits

Payments made to individuals who are temporarily out of work, providing financial support during unemployment.

Pink Slip

Informal term for the notice of dismissal given to an employee.